But here you have the Market Leader, the pretty much uncontested top of the Benchmark-Winner's heap: Samsung's Recent EVO Series - the SATA III 860 EVO as your optimal choice for a MacBook laptop or Mac desktop SSD upgrade - or for use in a Mac compatible external Thunderbolt or USB 3.0/3.1 DIY backup drive you can assemble in minutes.
There are also mSATA (below) and M.2 (above) form-factor 860 EVO SSD blades for those who want to build a compact 10Gbps USB 3.1 Gen2 USB-C or 5Gbps USB 3.0 external backup drive for MacOS, TimeMachine or other Mac file storage needs. All pretty much MAX-OUT the full bandwidth of 6Gbps SATA III interface. For better Read/Write performance you have to make the leap to PCIe interface NVMe drives featured elsewhere on this site.
For the extra 10 or 20 bucks of the Samsung drives over other brands, you'll get peak Read / Write speeds, mature firmware, highly efficient mapping and management of memory cells and a long 5 year warranty to reassure buyers they made the best choice. Simply stated, forget the rest, buy the best. You won't regret it.
NekTeck Thunderbolt3 SSD Drive
As we slowly transition away from standard 3.5" and 2.5" laptop drive form factors, 'blade' SSD's using small solid-state PCIe flash modules are clearly the future of Apple storage technology. As such, expect many USB-C and Thunderbolt 3 SSD storage peripherals for Mac to be quite small and compact - yet deliver mind blowing data transfer rates running natively on 40Gbps Thunderbolt 3 protocols.
Cable Matters Thunderbolt3 SSD Drive
We currently have 3 widely available and relatively cheap SSD Thunderbolt 3 blade drives on the market which all share the same OEM manufacturer and design, but are simply rebranded with Plugable, CableMatters, and NekTeck logos. All offer Read Speeds exceeding 2200 MB/sec and Write speeds around 1400 MB/sec under typical use. All are currently available just under $400 USD for a 480GB drive.
Plugable Thunderbolt3 SSD Drive
Note: These are Thunderbolt 3 NATIVE drives suitable only for the most recent MacBook Pro and iMac Pro era machines with 40Gbps Type-C Thunderbolt 3 ports. They do not operate in 10Gbps USB-C mode as other Type-C peripherals might on a TBolt3 port. And since the short 7 inch integrated cable isn't removable and there aren't dual pass-through TBolt3 ports - they're only usable directly connected to your Mac or as the last device in a Thunderbolt daisy-chain.
Many USB-C interface drives ship with both Type-A and Type-C cables for use on Apple computers old and new. When connected to a standard Type-A USB 3.0 port they'll operate with a maximum 5Gbps of available bandwidth. Depending on the SSD drive it may still perform identically.
A single SATA SSD is a fine match for USB 3.0 speeds. A dual SATA SSD RAID drive array is a somewhat better match for 10Gbps USB 3.1 Gen 2 bandwidth. It's only when you move into PCIe SSD modules or high-end multi-SSD drive arrays that you're best-off considering 20Gbps Thunderbolt 2 or 40Gbps Thunderbolt 3 storage solutions.
Honestly, unless you're a speed freak or have money to burn, the vast majority of Mac users just want affordable solutions that seem 'fast enough' for their computing needs - and fast and cheap USB 3.1 SSD external drives fit the bill perfectly.
It's Pro users - especially heavy video editing tasks that need and want high-performance, high-end storage solutions. Even then, they lean towards HDD hard drive arrays with huge multi-terabyle storage capacities to meet their needs. SSD-based arrays are only right when there's a massive budget available and storage needs are more modest - such as in music editing studios where file sizes aren't on the order of insane like 4K and 5K Ultra-HD video can be.